Speed-changing mechanism



Jul -14, 1925.. V v

' L. J..CAMPBELL SPEED CHANGING MECHANISM Filed llay 1921 4"S1ffts-Sheet1 July 14',- 1925.. 7' 1,545,580.

L. J. CAMPBELL SPEED CHANGINGMECHANISI'M I 1 Filed a e, 1 2 -4Sheets-Sheet 2 fizz/671??! [ewzLfQwz zbeZZ/ Jul 14. 1925.. 1,545,580

H L. J. CAMPBELL snap cmmeme MECHANISM Filed ua p, 1921 4 Sheets-Sheet 5jz uc-vzibr 'L. J. CAMPBELL SPEED CHANGING MECHANISM July 1.4, 1925.1,545,580

Filed May 1921 4 Sheets-Sheet 4 I .35 a I I 35- five/7121;; u (Zea z(Ewzyzbed Patented 1.1, 14, 1925.

UNITED STAT Es PATENT. OFFICE.

LEON JAY CAMPBELL, OF'BUCHANAN, MICHIGAN, ASSIGNOR T CAMPBELL TRANS--'MISSION COMPANY, OF BUCHANAN, MICHIGAN, A CORPORATION OF MICHIGAN.

SPEED-CHAN GIN G MECHANISM.

Application filed May 9,

To all whom it may concem: v

Be it known that I, LEON J. CAMPBELL, a citizen of the United States,residing at Buchanan, in the county of Berrien and Stateof Michigan,useful Improvements in Speed-Changing Mechanisms, of which the followingisa specification.

This inventionrelates to speed changing mechanisms for automobiles orother motor I 1 vehicles and more particularly toisuc'h mechanisms whichare actuated by the clutch pedals to effect changes of speed, the speedsbeing selected in advance by the operation of selective devices fromthe. steering wheel or other convenient location. 7

Among the objects of my invention is to improve the construction andoperation of such mechanisms in the several particulars ,as willhereinafter more fully appear, and to provide in particular-a speedchangingmechanism especially adapted an automobile transmissionmechanism of .the sliding\k ey and all-in-mesh gear type,

such as disclosed and claim ing application Serial 'No'. 322,837, filedSeptember 10, 1919/ Another object of my. invention is to provide amechanism wherein a continued downward movement of the clutch pedalafter releasing the clutch operates the speed changing mechanism toeffect a change of speed in the transmission, the load of the clutchspring being dropped before openatto neutral position or into anotherposition I than required for ing said mechanism by the clutch pedal, sothat there is noexcessive pressure .on the clutch'pedal during the timethat the speed change is taking place.

A further object of my invention is to render the mechanism positive andreliable in its action so that none other than the particular speedselected is" gained upon actuating the mechanism thro and furthermore]afford no opportunity,

while. operating vythe clutch pedal, to gain such'speed to shift allofthe parts back ingaining the selected speed.

.A still. further object of my invention is to look .through the speedchanging mechanism, inneutral position-and against accidental or othermovement that shift rod have invented new andv .as desired changingmechanism orefi'ectmg a change for use with in my copendugh the clutchpedal, 7 7

1921. Serial 11 0. 467,841;

of the transmission mechanism which is not being shifted to gain theselected speed.

Another object of the invention is to provide a lost motion connectionbetween the clutch pedal and the speed chan ing mechanism, so thattheclutchmay released through the actuation of the pedal as oftenwithout operating the speed of" speed thereby,

even though the mechanism hasbeen set to effect a change of speed whenthe pedal is actuated beyond clutch releasing position. Furthermore,this connection permits the mechanism tobe set for y speed deslred,either before or after the 'clutch' has been released, and thus allowfor a selection of a speed independently of the actuation-of theclutch'pedal and without throttling or stopping the motor.

The invention consists further inthe mat I ters hereinafter described;and more ticularly set forth in the appended claims.

:IE nthe accompanying drawings I 1g. 7 and wheel and change speedtransmission '1 is a. side viewiof the steering parmechanism of amotorvehlcle equipped with i a mechanically operated vice 'ofmyinvention; 1 v V Fi 2 is avtop plan view of the steering whee showingthe selector lever of my improved mechanism;

Fig. 3 is a fragmentary vertical sectional view taken on lined-3 of-Fig.2;v

Figs. 4 and 5' are vertical sectional views taken on lines 4-4 and 5-'5of Figs. 1 .and 4, respectively; V 1 I Figs. 6 and 7 are verticalsectional views taken on the single section line of Fig. 5,

speed changing (16- the former figure being a section in one di-v'rect1'on as indicated by the arrows 6, 6, and

the latter figure being a section in the opposite direction as indicatedby;

I Fig. 8 is a vertical sectional view. similar to F1g. 5, but showingthe mechanism' in first speed;

Fig. 9 is. a horizontal on line 9-9 of Fig. 8;

Figs. 10 to 13 inclusive are perspective top plan view taken the arrows'views of details of construction to be hereinafter described; v

14 to 17 inclusiveare' detail. views I showing the shift levers. inthe-difierent.

positions they occupy in the operation of my device; and

Fig. -18 is avertical sectionalview taken on line 18-48 of Fig. 4. c

In Fig. 1 of he accompanying drawings, 1 indicates .an automobiletransmission mechanism of the sliding key and all-inmesh gear type as.disclosed in my said copending application. To the. front end of- .thecasm of this mechanism is secured the bell houslng 2 of the clutchcasing, as in automobile construction. 1 From one'side of the casing 2extends ashaft 3 horizontally arranged, in the instance shown, ansecured to the end of this shaft exterior of the casing 2 is a lever 4'carryin at its upper end a foot pedal 5 within reac of the foot of thedriver of the car, as in the usual automobile .constructionand by meansof which the clutch is o erated in the customary manner. The c utchpedal 5 is also connected with the mechanism of my in vention so that achange of speed-may be effected through the transmission mechanism- 1 bythe driver pushing down on the clutch' pedal and releaslng the clutchfor that pur- To select the speeds desired,in advance of actuallychanging the speed by actuating 5, I mount in the bell hous-' the clutchpedal ing 2, above the shaft 3, a slide rod 6. This has connection witha selector located in the bell housing and to be hereinafter described.The rod 6 has oneend extending outside of the housing 2 and is connectedby the customary type of steering post connections with a hand lever/7at the upper end of the steering post column 8 and op erable at thesteering wheel 9. This lever 7 is fixed to a tube 10 in the steeringpost 8, and the tube is connected at its lower end with the rod 6through a bell crank lever and links as customarily used in connectionsof this'kind and as indicated in Fig. 1.

Mounted within the housing 2 are vertically arranged levers 11 and 12.These are arranged side by side and arerockably mounted on a horizontalshaft 13 extending between and journaled in lugs 14 in the housing. Forthe levers 11, 12 there are an equal number of shift rods 15, 16, .thesebe-- ing connected with the several sets of keys of the transmissionmechanism .1 in the manner shown and described in my said/copendingapplication. In the accompanying drawings, there are two shift levers15, 16, the former being'connected with the lower end of the lever 11',and the latter with the lower end of the lever 12, as shown in Figs.

.4 and 7. v

Arranged in the housing 2 is a vertlcal frame 17 rockably mounted at itslower end on a horizontal shaft 18 extending between and journaled inlugsv 19, as shown in Figs.

4 and 5. This frame is open and has yer-- tical side members 20, 20connected tother at their upper ends by a cross-memer 21, in-the rearside of which isa horizontal groove or T-slot 22, as clearly shown inFigs. 5, 8, and 13. In this slot is a selector'block 23, which has atone end an upright pin 24 extending into. a oove 25 m the underside ofabar 26 se ired to one end of. the rod 6, as clearly shown in Figs.

6 and 10. Therod 6 is at night-angles to the bar 26 or substantially so,and ls-slidably retained in a 'journal box 27 'iitthehousing 2, as shownin Figs. "5 and 8. The

bar 26 has its oppositefend in agroove 28 m the adjacent "face ofthebellhousing 2, as shown in said figures.

For rocking the frame 17 toward and from the levers 11 and 12, I employthe horizontal shaft 3. On this shaft, between the side arms 20 of theframe.17,'is clamped a yoke 31 having depending arms 32, these being.provided with outwardly projecting pins 33 at the sides thereof andWorking in elongated openings 34, in the side arms 20 of the frame, asshown in the drawings. The lower ends of the arms 32 work againstfork-shaped arms 35, fixed onthe shaft 18' and projecting above thesamewithin the frame 17. These arms 35 are provided with inwardly extendedpins 36 adjacent their upper ends and which engage in an annular groove.in a sleeve 37 vslidably mounted-on the clutch shaft 38 extending intothe bell housing .2 and through. the frame .17, as shown.

The mechanism shown operates as followsi When the keys of thetransmission mechanism in thecasing -1 are in neutral, the parts'of mypresent device occupy the positions shown in Fig. 5, and when in suchpositions the frame 17 stands swung out from the levers 11, 12, and bothof said levers are in the same vertical position, as shown. The innerends of the slots 34- are in contact with the shaft 3 and prevent theframe 17 from being swung farther away from the "levers 11, 12. 'Atthistime, the

"selector-block 23 is'in neutral position with" its lug 29 between thelevers 11, 12 and out of the path of any of the lugs of said levers, sothat should the frame 17 be swung toward said levers, the lug 29 willnot operate against the same-to move them out of their in toward thelevers at this time, the selector-- 23 is providedwith a bottom recess23, and

the upper edge of the body portion 30 clears the lower ends of the upperlugs of said levers. The height of thebody portion '30 is such that itclears the lower lug 11 of the lever 11 when the lever is rocked towardthelevers at this time.

To set the mechanism to throw into low or first speed, the hand lever 7on the steering wheel ismoved from the neutral position shown in 2, intoposition opposite the'numeral 1 marked on the annular indicator ring 7carried onthe steering wheel. This slides the selector block 23 towardthe left, when. the parts "are viewed as shown in Fig. l and carries thelug 29 in position to contact with the upper lug 12* of the lever 12when the frame 17 is swung toward said levers. When thatis done, the

lever 12 is rocked upward by the upper end of the lug 29 operating onthe front face of the upper lug 12 The front faces of the upper andlower lugs of the levers are inclined, and when in neutral, as shown inFig. 5, they converge inwardly. Thus when the lug 29 contacts with'theupper lug 12", as described, the lever 12 is rocked upward to draw'theshift rod- 16 outward to move the keys connected with said rod and gainfirst or low speed in the transmission mechanism in the box 1. When thelug 29 has reached the limit of its inward swin ing movement,rit ridesunder thelower en of the lug l2 and holds the lever 12 locked in theposition into which it has been swung,

as shown infull lines in Fig. 8. The bottom recess 23 in' the selector23 is wide enough to allow the selector to be moved to the extentdescribed without carrying 'said recess out of the, path of the lowerlug 12", thus 'permitting said'lug to enter said recess when the lever12 is rocked upward and not hindering that movement. The body part 30 ofthe selector at this time moves freely into the space between the upperand lower lugs 11, 11 of the lever 11 without rocking said lug, and inaddition holding said'lever from bemg rocked accidentally or otherwisewhile the other lever is moved to gain ffirst speed, as shown in Fig.'8'. The frame 17 is I rocked by thedriver of the: car pushing down onthe clutch pedal 5. Normally the spring 39 (Fig. '5) holds the clutch inen gagement with its. cooperating part so that power may be transmittedfrom the engine to the rear wheels of the car through-the transmissionin the, box 1. When the foot a continued downward movement on the footpedal 5 will rock the frame 17 and operate,

the lever 12 to secure first speed. On. re-

leasing the foot pedal 5, after-the speed has been secured, the spring39 returns the clutch into engagement and also returns the frame 17 toits normal position, as shown in Fig; 5, the selector 23 and other partsremaining in the positions just described.

Toobtain the next or second speed, the

hand lever 7 is moved over the indicator L ring 7 until opposite thenumeral 2, designating second speed and inso doing the selector 23 ismoved toward the right, when the parts are viewed as in Fig.v 4, fromthe position described for first'sp'eed into position 'for second speed.This shifts the lug 29 into position oppositethe lower lug 11 of thelever 11 and brings the left-hand portion of the body part 30 in thepath of the lowerlug 12 of the lever 12 (Fig.15) and as said lug 12 isprojected above the lug 11", the selector part 30 will contact withthelug 12 in advance of thelug 29 engaging the lower lug 11 so as to throwthe lever 12 back to neutral position before rocking.

upper end of the lever 11 rocking down into the upper recess 23 of theselector, as shown in dotted lines in Fig. 17. The body por tion 30 ofthe selector being between the up r and lower lugs of the lever 12,'asshown m Fig. 14, holds said lever from movement,

accidentally 'or otherwise, in either direction during the shifting ofthe lever 11. The frame 17 is moved to secure this speed by operatingthe clutch pedal 5, as before.

Tomove into third or high speed, the hand lever 7 is moved over theindicator ring 7' into position opposite the numeral 3.

marked on said ring, and in so doing the selector 23 is moved its fulldistance toward the .right when the parts are viewed as in Fig. 4. Thisshlfts or moves the lug 29 out of the path of the lower lug 11 and intothe path of the upper lug 117 of said lever 11, which lug 11 at suchtime is projecting downward .and in position to have its inclined frontface to be engaged by the upper end of 111g 29. As the frame 17 is swunginward, said lug, 29 rocks the lever 11 upward and comes to rest underthe lower end of said lug to.

hold it from downward movement, as hereto fore described in connectionwith the lever 12.. The lower slot 23 has at this time been shifted toreceive the lower lug 11 and allows the lever 11 to be swung upward asde' scribed. This causes a movement ofthe shift rod 15 to secure thirdor high speed,

and the frame 17 is rocked inward for this lug 2 9 in path the lower lug12* of the lever 12 andthe'u'pper s'lot 23" in path of the upper end ofthe lever12. The part 30.

of the selector on ,the right of the lug 29- is at this time inposition' to contact with the now raised lower lug 11". of the lever 11,so

15 that when the frame 17 is swung in contact with the levers the part30 will first engage the lower lug 11 androck the ldver 11 into neutralposition before the lowerend of the In '29- contacts with the lower lug12*.

: A. I er the lever. .11 has been rocked'into neutral position, thecontinued swinging of the frame 17 inward causes the lug 29 to. operateagainst the lower lug 712* andswings the lever 12 downward to actuatethe shift rod 16 and set the transmission into reverse speed. F

To go from reverse to neutral the hand lever 7 is moved back totheposition indicated by letter*N on the. ring 7, and this 30 shiftsthe lug29 into the position previously described for neutralf tion to operateagainst the upperlug 11. and rock the lever 11 upward into neutralposition. 'With the mechanism described any speed may be selected beforethe particular speed is to be used. For instance, while the car 40 istraveling over a roadway at high or in third speed, the speed changingmechanism maybe set in a slower speed so that that speed may be had theinstant the occasion demands and thusavoid wasting any time in shiftinginto that speed when it isneeded.

This may be necessary when ascending a grade or in a sand stretch, orother place where a slower speed is required. Thus, before reaching thegrade or sand stretch, the

operator can select the particular speed desired by turning the handlever 7 on the steering wheel opposite the indicated mark for the'speeddesired and that will shift the selector 23 into position on the frame17 to immediately establish'the speed selected when the operatoractuates the foot pedal 5 tothrow in the speed. Likewise, when the caiisrunning in first or-slow speed, the op erator may, in advanee'of thetime when a higher speed is required, set the mechanism into that speedor even into reverse. The arrangement and shape of the slots 34'are such"that the frame-17 is not swung into engagement with the levers 11 and12 until after the clutch has been released so that exten The lever-11is'already in neutral and "the. part 30 of the se =lector 23 at the leftof the lug. 29. is in posithe clutch ma be released whenever theoccasion demand s'without swinging the frame 17 andthus avoid changingspeeds when that is not required. a

- The pin 24 being in the slot 25 permits the frame 17 to be rocked intoand out of contact with thelevers 11, 12, yet connects the selector 23with the slide rod 6. -The cross bar 20 of the frame 17 is provided atone end with'a plurality of upwardl I ding across the member 21, asshown in projecting parallel teeth or ribs 40 Fig. 13. These ribs orteeth form between them a plurality of slots to receive a dependin pinAlon t e bar 26 and offset from one si e of the pin 24, as shown in Fig.10. The

inner ends of these ribs 40 are beveled or inclined, as shown in Fig.5), so that should the selector 23 be shifted a little to one side orthe'othe'r'of the position selected, the pin 41, while being slightlyout of the p the particular groove into which it is to be moved, willwhen engaged by the rib 40 be drawn into the particular. groove, and enable noneother than the selected'speed being gained. ,The p11 tion is toline up and in theselecting means.

xzpose of this construc' isregard the lost play:

path of -In order to allow the clutch pedal to be. i

pressed downward beyond the stroke of the clutch, after being released,to dropthe load of the clutch spring and'place no excessive pressure onthe clutch pedal while changing a speed in the transmission, I make theupper ends of the arms 35 forked to receive the lower ends of the arms32, which when in normal position are as shown in Figs. 5 and 18,- Asillustrated, the lower end of each arm 32 is designed to engage the rearside 42 of the fork, so that when the clutch pedal is pushed downward,it will, in

releasing the clutch, swing the arms 35 backward a-nd, by the lostmotion connection provided between the arms 32 and frame 17 through theslots 34% and pins 33, permit the clutch to be released in advance ofmoving the frame 17. As this movement is continued, the frame 17 isrocked after the angled off so that the greater load of the clutch isdropped before a speed-is selected, and allows the clutch pedal tobepushed downward beyond clutch releasing position clutch has beenreleased, the edges 42 being -11 to actuate the frame 17 and change thespeed selected. Thus, all the power applied on the clutch pedal is usedto change the speed, with the result that the speed change is mademanually. allows a speedchange to be made over any hindrance likely tooccur by the lubricant m ing hard and stiff.

The ring 7", as shown in Fig. 2, vided' on. its under side with adepending, circular flange 7", cut away between stations the gear boxbecom moved back and .forth'between those stations without hindrance bysaid flange 7 means of which the member may be pushed 7 inward to carrythe same out'of the path of the flange 7 and thus-permit the lever 7 tobe moved in reversefiposition. This member carries a roller 7 9 tobearagainst the inner-edge of the ring for guiding purposes and toengage in shallow notches for holding the lever against accidentalmovement.

' Normally the member 7 standsin the path of the flange 7 to' preventthe lever from bei-n moved accidentally into reverse. As s own in-Fig.4, there is a coiled spring 118 on one of the ln 19and engaging the 20frame 17. This acts to hold the frame from.

1 rattling by the vibrations to which the automobile is subjected whiletraveling overa roadway; p I

The changing speed mechanism as described and an automobile transmissionmechanism of the sliding key and all-inmesh type as disclosed in my saidco-pending application, is simple in construction when compared withgear shifters hereto fore designed and used. It is positive and reliablebecause it insuresithe selection of none other than the speed desiredand holds one of the levers in neutral position and against accidentalor other movements while 35 being shifted to gain change of speed. I Thegears of the transmission being constantly in mesh and the sliding keytype of engagement speed changing can be doneswithout synchronizing ofthe gears or throttling of the motor before the speed changes can bemade. Thus, the change of speed is quick and immediate and at theinstant the occasion demands regardless of road conditions.

The lu of the levers 11 and 12 being above and b having inclined contactfaces, as shown, permit the selector 23 to have a substantially straightline movement into and out of contact, with the lugs. This reduces tothe 0 minimum the amount ofthrow or swing required for the frame 17 andthus enables the mechanism to be accommodated readily and easily bythe-usual bell housing 2 without I increasin [the dimensions of thatpart.

" The se ectorrbar 23 is made in one piece and performs three duties.It'neutralizes the levers, selects the speed desired, and also acts as alock for the levers for preventing 0 two speeds frombeing engaged at thesame time. This brings all of the parts for the several duties intoonepart, thus reducing the cost of the oonstruction'and simplifying it.Other and further ob'ects of my invention will be apparent to t oseskilled in the art to which. my invention relates.

,otal" points and spaced apart laterally, a

elow the pivotal point 13, and

While I have shown and described herein in detail. a speed changingmechanism, it is to be of course understood that the details ofconstruction and arrangement of-parts illustrated umay be variouslychanged and" modified without departing from the spirit a and scope ofmyinvention. a

, I claim as my invention: V

l. A speed changing mechanism, comprising shift levers arran ed side byside and pivoted intermediate t eir ends,.a rockably mounted member, aselector slidably carried by said member and movable therewith into andout of cont-act with said levers in the arc of a circle assing throughthepivotal points of said levers for .movin the same in eitherdirection, means for ad usting said selector for any pivotedintermediate their ends, a rockably mounted member, a selector slidablycarried by said member and movable therewith into and out of contactwith said levers in the arc of a circle passing through the pivotalpoints of said levers for moving the same in either direction, means foradjustingsaid selector to engage any of said levers on either side oftheir pivotal. points, and means for swinging said member..

3. A speed changing mechanism, comprising shiftlevers arranged side bysiderand pivoted intermediate their ends, said levers having lugs onopposite sides of their piv-' rockably mounted member, a selectorslidably carried by said member and movable therewith into and out ofcontact with said lugs for moving the levers in either direc tion, meansfor adjusting said selector for any of the lever lugs, and means forswinging said member. I

4 4. speed changing mechanism, comprising shift levers arranged side byside and pivoted intermediate their ends, a rockably mounted member, aselector slidably carried by said member and movable-therewith into andout of contact with said levers for moving the same in either direction,means on the selector for holding one lever against movement whileanother lever is being moved, means for adjusting said selector for anyof said levers, and means for swlnging said member.

5. A speed changing mechanism, comprising shift levers arranged side byside and pivoted intermediate their ends, said levers having lugs onopposite sides of their pivotal points and spaced apart, laterally, a

1rockably mounted member, a selector slidably carried by said member andmovable therewith into and out of contact with said lugs for movin thelevers in either direction, means on t e selector to enter between thelugs of the levers for holding one lever against movement while anyother is being moved, means for adjusting said -selector for any of thelever lugs, and means for swinging said, member.

6. A speedchanging mechanism, comprising shift levers arran ed side byside and pivoted intermediate t eir ends, said levers having lugs onopposite sides of their pivotal points and spaced apart laterally, saidlugs having inclined faces converging inward toward the pivotal pointsof the levers, a rockably mounted member, a selector slidably carried bysaid member and movable therewith toward and from said levers, saidselector havin a lug to engage the inclined faces of the ever lugs formoving said levers 'in either direction, means for ad- {listing saidselector for any of said lever u s, and means for swinging said member.A speed changing mechanism, comprising shift levers arranged side byside and pivoted intermediate their ends, said-levers having lugs onopposite sides of their pivotal points and spaced apart laterally, saidlugs having toward the pivotal pointsof the levers, a

rockably mounted member, a selector slidably carried'by said member andmovabletherewith toward and from said levers, said selector having a lugto engage the inclined faces of the lever lugs for moving the levers ineither direction, said selector lug being carried beyond the innerendsof said inclined faces, means for adjusting said selector for" any ofthe lever lugs, and: means for swinging said member.

8, A speed changing mechanism, comprising shift levers arranged side byside and pivoted intermediate their ends,'said levers having lugs, onopposite sides of their pivotal points and spaced apart laterally, a

rockably mounted member, a selector slidably carried by said member andmovable therewith toward and from said levers,'said selector having alug to engagethe lever lugs for moving the levers in either direction,means for adjusting said selector for any of the lever lugs, and meansfor swinging said member, said selector having re-,

cesses'on opposite sides-of its lug to receive.

the lever ln 9. A speed changing mechanism, comprising shift leversarranged side by side and pivoted intermediatetheir ends, a rockablymounted member, a selector slidably carried by said member and movableinto and out of contact with said levers for moving the lectorforengaging one lever in advance of another for movingv the former intoand holding it in neutra position before. the selector actuates theother lever, means for Q 4 adjusting said selectorfor any of saidinclined faces converging levers, and means for swinglng said memr. y jp 10. A speed changing mechanism, comprising shift levers arranged sideby side and pivoted intermediate their ends, a rock-' selector, in themovement of the latter to- .ward 'the levers, into proper position toact' on the lever for which the selector is set in advance of contact ofthe selectorwith said lever, and means for actuating said member.

11. A speed changing mechanism, comprisin shift levers arranged side byside and plvoted-intermediate their ends, a rock ably mounted member, aselector slidably carried by said member andmovable there with into andout of contact with said levers for moving the same in .eitherdirection,

means for adjusting the selector for any of said levers, means forswinging said member, and means for automatically adjusting the selectoron the member comprising ribs with beveled ends on one part-and a pinfixed' on the other part. v

12. A speed changing mechanism, comprising shift levers, a rockablymounted frame, a selector slidably carried by said frame and movabletherewith into'and out of contact with said levers for moving the samein either direction, means for adjusting said selector for any of saidlevers, a shaft extending through slots in the sides of said frame, ayoke between the sides of said frame and fixedoii said shaft, arms onsaid yoke, pins on said arms and extending into said slots, for rockingsaid frame by said shaft, and means for actuating said shaft. I

13. A speed changing mechanism, comprising shift levers pivotedintermediate their ends, a rockably mou'nted member, a

selector slidably carried by said member and movable therewith into andout of contact with said levers for moving the same in either direction,means for adjusting said selector for any of said levers, a clutch pedalfor swinging said member, and means pro-- viding a lost motion.connection between said member and said pedal forenabling the clutchpedal to release the clutch in advance of swinging said member.

14.'A speed changing mechanism, comprising speed changing elements, aselector for actuating said elements in either direction, means foradjusting said selector for any of said elements, ashaft, a yoke fixedthereon and having arms, rock arms ex tending toward said yoke arms;said rock moved by j said yoke arms a distance to release the clutch forenabling'the yoke arms tomo've the selector intoengagem'ent with saidelements, anda clutch pedal connected with said shaft ,for actuating thesame.

mechanism, com- '=15.Aspeedch 10 prising speed changing ements, a. onepiece selector movable into and out, of contact with said elements formoving the same in either direction, a member for carrying said selectorinto and out of voperative engageji ment'with said elements, saidselector oarrying 'means for neutralizing one element advance of themovement of another element and for holding the neutralized element inneutral position while moving the other element,;all in the movement ofsaid selector toward said elements, .means for moving said member towardand from said elements for carrying the selector "into and outo'fgcontact' therewith, and independent means for adjusting saidselector on'said member for any of said elements.

- In testimony that I claim the foregoing as my invention, I aflix mysignature this 6 day of May, A. -D. 1921.

' -*LEONJAY CAMPBELL.

